211123212061 has 2 divisors, whose sum is σ = 211123212062. Its totient is φ = 211123212060.

The previous prime is 211123211993. The next prime is 211123212073. The reversal of 211123212061 is 160212321112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 174332135961 + 36791076100 = 417531^2 + 191810^2 .

It is a cyclic number.

It is not a de Polignac number, because 211123212061 - 2⁷ = 211123211933 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211123212661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105561606030 + 105561606031.

It is an arithmetic number, because the mean of its divisors is an integer number (105561606031).

Almost surely, 2^211123212061 is an apocalyptic number.

It is an amenable number.

211123212061 is a deficient number, since it is larger than the sum of its proper divisors (1).

211123212061 is an equidigital number, since it uses as much as digits as its factorization.

211123212061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 22.

Adding to 211123212061 its reverse (160212321112), we get a palindrome (371335533173).

The spelling of 211123212061 in words is "two hundred eleven billion, one hundred twenty-three million, two hundred twelve thousand, sixty-one".